The current radar-based air traffic control system (shown here) will eventually be replaced with a new system called NextGen, which will rely on GPS. A number of computer security experts are concerned that NextGen is insecure and vulnerable to hackers.
John Moore/Getty Images
hide caption

Could The New Air Traffic Control System Be Hacked?

Feb. 16, 2009: Flowers are left in memorial near where Continental Connection Flight 3407 crashed in Clarence, N.Y. Fifty people died. Pilot fatigue was cited as a factor.
David Duprey/pool/Getty Images
hide caption